Air filter



Nov, 27, 1928.

W. M. REED ET AL AIR FILTER Filed March 5 Patented Nov. 27, 192%..

arren stares PATENT @FFHQE.

WILLIAM M. REED AND CHESTER P. HEGAN, F LOUISVILLE, KENTUCKY, ASSIGNORS T0 REED AIR FILTER COMPANY, OF LOUISVILLE, KENTUCKY, A CORPORATION OF KENTUCKY.

AIR FILTER.

Application filed March 3, 1926 Serial No. 91,860.

This invention relates to air filters and pertains more particularly to a gasket for preventing-leakage of air between a filter cell and a surrounding framework.

In many types of air filters it is. customary practice to provide a supporting framework carrying one or more cells filled with filtering media, which cells are removable from the supporting framework in order that they may be cleaned of accumulated dust and dirt from time to time. Leakage of air between the filter cell and the framework sometimes permits the passage of dust or dirt into the current of filtered air and, accordingly, it is 155 desirable to reduce this leakage to a minimum. It is an object of this invention to provide means to prevent such air leakage, 'nch means comprising, in the preferred'emadiment illustrated, a gasket arranged to if the interstices between the filter cell and name.

It is a further object of the invention to rovide a gasket which shall be simple and inexpensive to construct, but which shall be durable under varying conditions.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in which,

Figure l is a front elevation. of a filter cell, part of the cell being broken away to better illustrate the location of the gasket.

Figure/2 is aside elevation also broken away, and I 4 Figure 3 is an enlarged sectional view taken on the line 3+3 of Figure 1.

Referring to the drawings, the filter cell 1 is supported in a framework 2 which may surround the entire outer periphery ofthe cell. The framework 2 may convenientlybe formed of channel bars welded or otherwise secured at the corners, said channel bars providing the flanges 3 which lie against the flange 4 of the filter cell when the cell is in operative position.

The channel bars also provide the flanges 5 at the rear of the cell which extend in close proximity to the side faces of the cell but which leave an appreciable space therebetween.

Tn order to fill this space and thus prevent leakage of air between the filter cell and the frame, it is proposed to provide gaskets 6 arranged in position to pack the space between the cell and frame. These gaskets may be secured to all four sides of the frame and may consist of a strip of'felt of a width sufiicientto provide a flexible edge 7 which l1es between the cell and frame.

As illustrated in the accompanying drawings, the gasket may be conveniently fastened to the flange 5 of the frame. As a convenient means of attaching the gasket to the frame, the inner edge of the felt strip may be clamped in a metal channel 8 having a series of apertures therein through which it may be secured to the frame by means of rivets 9. Preferably the channels are somewhat shorter than the felt strips in order that the strips may be flexible at the corners to permit them to flex as the cell is inserted in the frame.

In setting up the filter, the frame with the gaskets attached may first be placed in posithe depth of the framework. Accordingly,

as the cell is inserted, the rear of the cell is caused to protrude through the framework and the free edges of the gaskets are forced outwardly to form a tight packing between the cell and frame.

Tt will be understood that the invention may be variously modified and embodied within the scope'of the subjoined claims.

N e claim as our invention:

1. In an air filter comprisinga unit filter cell and surrounding frame, a gasket adapted to prevent leakage between said cell and its surrounding frame, said gasket comprisin a strip of flexible material having a substantial portion of its area rigidly secured to said rame, but having an edge free to flex between said frame and cell.

2. In an air filter comprising a unit filter cell and surrounding frame, a gasket adapted to prevent leakage between said cell and its surrounding frame, said gasket comprising a strip of fiexible material having a substantial portion of its area and one of its edges bound in a metal channel, but having an edge free to flex between said frame and cell, said gasket being riveted to said frame.

3. A gasket for air filters comprising, a strip of flexible material, a metal channel surrounding one edge of said strip, but leavand strip being provided with rivet holes through which the gasket may be secured to a supporting member.

4. A gasket for air filters comprising, a strip of flexible material, a metal channel surrounding one eclge of said strip, but leaving the other edge free to flex, said channel being of a length less than the length of ssirl strip, said channel and strip being providecl With rivet holes through which the w gasket may be securecl to a supporting memher.

In testimony whereof, We have signed our names to this specification this 19th day of February, 1926.

WILLIAM M. REED. @HESTER 1P. HEGAN, 

